Thanks. I will be coming with my family ( me, wife and 11 yrs old daughter) at 4.30 pm by Air-asia on Nagoya airport on 20th Oct. I will need help in
1. Travel route. I have no fix plan as to where we should go.
2. where to stay
3. And how to organize the bookings etc.

It's pretty hard to make up an itinerary out of the blue. What you could do is head over to Kyoto and explore the Kansai Area from there. Both Osaka and Nara can easily be reached from there and there's a lot to see and do in Kyoto for children. Kyoto as many budget accommodations too, have a look over at booking websites such as traveladviser or expedia and I am sure that you'll find something you like!